Conventional original equipment manufacturer vehicles altered to operate on propane, natural gas, methane, ethanol, or electricity are classified as aftermarket AFV conversions. All vehicle conversions for vehicles certified only to California Air Resources Board (CARB) standards must meet current applicable CARB standards for aftermarket conversions. However, Environmental Protection Agency (EPA) certified conversion kits may be used on EPA 50-state certified vehicles and vehicles with dual-certification that are 14,000 pounds or less. (Reference Code of Maryland Regulations 26.11.34)

The Maryland Energy Administration (MEA) provides funds to deploy "game changing" or innovative transportation projects that increase the use of alternative fuel vehicles, such as workplace charging. Projects must be located in Maryland and have the potential to significantly advance the clean energy market through commercially available technologies. Projects can include clean energy conversion technologies, systems, or applications used in other states or regions of the world, but not commonly used in Maryland. Grant awards are available for up to 30% of the total project cost with individual awards ranging from $50,000 to $250,000. The program is not currently accepting applications (verified May 2018). For more information, including program application and award requirements, see the MEA Game Changer Competitive Grant Program website.